The Pristine Survey -- VI. The first three years of medium-resolution follow-up spectroscopy of Pristine EMP star candidates

Abstract

We present the results of a 3-year long, medium-resolution spectroscopic campaign aimed at identifying very metal-poor stars from candidates selected with the CaHK, metallicity-sensitive Pristine survey. The catalogue consists of a total of 1007 stars, and includes 146 rediscoveries of metal-poor stars already presented in previous surveys, 707 new very metal-poor stars with [Fe/H] < -2.0, and 95 new extremely metal-poor stars with [Fe/H] < -3.0. We provide a spectroscopic [Fe/H] for every star in the catalogue, and [C/Fe] measurements for a subset of the stars (10% with [Fe/H] < -3 and 24% with -3 < [Fe/H] < -2) for which a carbon determination is possible, contingent mainly on the carbon abundance, effective temperature and S/N of the stellar spectra. We find an average carbon enhancement fraction ([C/Fe] >= +0.7) of 41 +- 4% for stars with -3 < [Fe/H] < -2 and 58 +- 14% for stars with [Fe/H] < -3, and report updated success rates for the Pristine survey of 56 % and 23 % to recover stars with [Fe/H] < -2.5 and [Fe/H] < -3, respectively. Finally, we discuss the current status of the survey and its preparation for providing targets to upcoming multi-object spectroscopic surveys such as WEAVE.

arXiv comment13 pages 6 figures, accepted for publication in MNRAS

References in corpus (57)

• The Sloan Digital Sky Survey: Technical Summary
• Gaia Data Release 2. Summary of the contents and survey properties
• SDSS-III: Massive Spectroscopic Surveys of the Distant Universe, the Milky Way Galaxy, and Extra-Solar Planetary Systems
• The Baryon Oscillation Spectroscopic Survey of SDSS-III
• SEGUE: A Spectroscopic Survey of 240,000 stars with g=14-20
• Nucleosynthetic signatures of the first stars
• LAMOST Experiment for Galactic Understanding and Exploration (LEGUE) The survey science plan
• SkyMapper and the Southern Sky Survey
• Carbon Enhanced Metal-Poor Stars. I. Chemical Compositions of 26 Stars
• The Formation of the First Low-Mass Stars From Gas With Low Carbon and Oxygen Abundances
• A Spectroscopic Study of the Ancient Milky Way: F- and G-Type Stars in the Third Data Release of the Sloan Digital Sky Survey
• SkyMapper Southern Survey: First Data Release (DR1)
• The DESI Experiment, a whitepaper for Snowmass 2013
• The GALAH Survey: Second Data Release
• Abundances for metal-poor stars with accurate parallaxes I. Basic data
• The Most Metal-Poor Stars. II. Chemical Abundances of 190 Metal-Poor Stars Including 10 New Stars With [Fe/H] < -3.5
• An extremely primitive halo star
• 4MOST: Project overview and information for the First Call for Proposals
• The Pristine survey I: Mining the Galaxy for the most metal-poor stars
• New ATLAS9 And MARCS Model Atmosphere Grids for the Apache Point Observatory Galactic Evolution Experiment (APOGEE)
• Observational Constraints on First-Star Nucleosynthesis. I. Evidence for Multiple Progenitors of CEMP-no Stars
• Chemical Evolution in Hierarchical Models of Cosmic Structure II: The Formation of the Milky Way Stellar Halo and the Distribution of the Oldest Stars
• TOPoS: II. On the bimodality of carbon abundance in CEMP stars. Implications on the early chemical evolution of galaxies
• High-Resolution Spectroscopy of Extremely Metal-Poor Stars from SDSS/SEGUE: I. Atmospheric Parameters and Chemical Compositions
• Where are the most ancient stars in the Milky Way?
• Tracing the formation of the Milky Way through ultra metal-poor stars
• Center-to-Limb Variation of Solar 3-D Hydrodynamical Simulations
• SDSS-V: Pioneering Panoptic Spectroscopy
• Chemical Abundances of the Milky Way Thick Disk and Stellar Halo I.: Implications of [alpha/Fe] for Star Formation Histories in Their Progenitors
• The oldest and most metal poor stars in the APOSTLE Local Group simulations
• Pristine Dwarf-Galaxy Survey I: A detailed photometric and spectroscopic study of the very metal-poor Draco II satellite
• The Pristine Survey IV: Approaching the Galactic metallicity floor with the discovery of an ultra metal-poor star
• TOPoS: IV. Chemical abundances from high-resolution observations of seven EMP stars
• A collection of model stellar spectra for spectral types B to early-M
• TOPoS: I. Survey design and analysis of the first sample
• Metal-Poor Stars Observed with the Magellan Telescope II. Discovery of Four Stars with [Fe/H] < -3.5
• Seeding the Second Star: enrichment from population III, dust evolution, and cloud collapse
• The Pristine survey III: Spectroscopic confirmation of an efficient search for extremely metal-poor stars
• SkyMapper stellar parameters for Galactic Archaeology on a grand-scale
• Classification of extremely metal-poor stars: absent region in A(C)-[Fe/H] plane and the role of dust cooling
• Chemical Abundance Signature of J0023+0307 -- A Second-Generation Main-Sequence Star with [Fe/H]<-6
• Where are the First Stars now?
• J0023+0307: A mega metal-poor dwarf star from SDSS/BOSS
• Enormous Li-enhancement preceding red giant phases in low-mass stars in the Milky Way halo
• The Most Metal-Poor Stars. V. The CEMP-no Stars in 3D and Non-LTE
• The Pristine Dwarf-Galaxy survey - II. In-depth observational study of the faint Milky Way satellite Sagittarius II
• Statistical methods of automatic spectral classification and their application to the Hamburg/ESO Survey
• WHT follow-up observations of extremely metal-poor stars identified from SDSS and LAMOST
• Origin of the CEMP-no Group Morphology in the Milky Way
• Follow-up observations of extremely metal-poor stars identified from SDSS
• An equatorial ultra iron-poor star identified in BOSS
• Fingerprint of the first stars: multi-enriched extremely metal-poor stars in the TOPoS survey
• J0815+4729: A chemically primitive dwarf star in the Galactic Halo observed with Gran Telescopio Canarias
• The Detailed Science Case for the Maunakea Spectroscopic Explorer: the Composition and Dynamics of the Faint Universe
• Milky Way tomography with the SkyMapper Southern Survey: I: Atmospheric parameters and distances of one million red giants
• New ultra metal-poor stars from SDSS: follow-up GTC medium-resolution spectroscopy
• TOPoS V: Abundance ratios in a sample of very metal-poor turn-off stars

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• The Pristine survey X: a large population of low-metallicity stars permeates the Galactic disk
• Gaia Data Release 3: The Galaxy in your preferred colours. Synthetic photometry from Gaia low-resolution spectra
• The Pristine survey VIII: The metallicity distribution function of the Milky Way halo down to the extremely metal-poor regime
• Exploring the origin of low-metallicity stars in Milky Way-like galaxies with the NIHAO-UHD simulations
• Pristine IX: CFHT ESPaDOnS Spectroscopic Analysis of 115 Bright Metal-Poor Candidate Stars
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• Beyond spectroscopy. I. Metallicities, distances, and age estimates for over twenty million stars from SMSS DR2 and Gaia EDR3
• The Pristine Inner Galaxy Survey (PIGS) II: Uncovering the most metal-poor populations in the inner Milky Way
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• The Photometric Metallicity and Carbon Distributions of the Milky Way's Halo and Solar Neighborhood from S-PLUS Observations of SDSS Stripe 82
• The Pristine survey -- XXIII. Data Release 1 and an all-sky metallicity catalogue based on Gaia DR3 BP/RP spectro-photometry
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• SPLUSJ210428.01-004934.2: An Ultra Metal-Poor Star Identified from Narrowband Photometry
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• The Pristine survey -- XII: Gemini-GRACES chemo-dynamical study of newly discovered extremely metal-poor stars in the Galaxy
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• Dynamically Tagged Groups of Metal-Poor Stars from the Best \& Brightest Survey
• High resolution spectroscopic follow-up of the most metal-poor candidates from SkyMapper DR1.1
• The Pristine Dwarf-Galaxy survey -- IV. Probing the outskirts of the dwarf galaxy Boötes I
• The Pristine survey XIII: Uncovering the very metal-poor tail of the thin disc
• Metallicity Distribution Functions of 13 Ultra-Faint Dwarf Galaxy Candidates from Hubble Space Telescope Narrowband Imaging
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• The Pristine Inner Galaxy Survey (PIGS) V: a chemo-dynamical investigation of the early assembly of the Milky Way with the most metal-poor stars in the bulge
• The Pristine survey -- VII. A cleaner view of the Galactic outer halo using blue horizontal branch stars
• Dynamically Tagged Groups of Metal-Poor Stars II. The Radial Velocity Experiment Data Release 6
• Phase-space Properties and Chemistry of the Sagittarius Stellar Stream Down to the Extremely Metal-poor ($[Fe/H]\lesssim -3$) Regime
• Targeting Bright Metal-poor Stars in the Disk and Halo Systems of the Galaxy
• Assessing the performance of LTE and NLTE synthetic stellar spectra in a machine learning framework
• The Pristine survey -- XV. A CFHT ESPaDOnS view on the Milky Way halo and disc populations
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• The Pristine survey XIV: chemical analysis of two ultra-metal-poor stars
• Probing the early Milky Way with GHOST spectra of an extremely metal-poor star in the Galactic disk
• Metallicity Distribution Function of the Eridanus~II Ultra-Faint Dwarf Galaxy from Hubble Space Telescope Narrow-band Imaging
• The Stars of the HETDEX Survey. I. Radial Velocities and Metal-Poor Stars from Low-Resolution Stellar Spectra
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• The Pristine Inner Galaxy Survey (PIGS) IV: A photometric metallicity analysis of the Sagittarius dwarf spheroidal galaxy
• Discovery of an $[Fe/H]\sim -4.8$ Star in $Gaia$ XP Spectra
• The Pristine Inner Galaxy Survey (PIGS) X. Probing the early chemical evolution of the Sagittarius dwarf galaxy with carbon abundances
• Matter accretion in metal-poor stars down to extremely metal-poor stars and the lithium problem
• The Pristine survey: XXV. The very metal-poor Galaxy: Chemodynamics through the follow-up of the Pristine-Gaia synthetic catalogue
• The Pristine Inner Galaxy Survey (PIGS) IX. The largest detailed chemical analysis of very metal-poor stars in the Sagittarius dwarf galaxy
• The Pristine survey -- XX: GTC follow-up observations of extremely metal-poor stars identified from Pristine and LAMOST
• Two Populations of Carbon-Enhanced Metal-Poor Stars in the Disk System of the Milky Way
• Could very low-metallicity stars with rotation-dominated orbits have been shepherded by the bar?
• Stellar Loci VI: An Updated Catalog of the Best and Brightest Metal-poor Stars
• Mapping the Milky Way with Gaia Bp/Rp spectra I: Systematic flux corrections and atmospheric parameters for 68 million stars
• A method for identifying metal-poor stars with Gaia BP/RP spectra
• The Pristine survey XXVIII. Journey to the Galactic outskirts: Mapping the outer halo red giant stars down to the very metal-poor end
• Estimating lifetimes of uv-selected massive galaxies at $0.5\le z\le 2.5$ in the cosmos/ultravista field through clustering analyses
• StarUnLink: identifying and mitigating signals from communications satellites in stellar spectral surveys
• The metal-poor tail of the APOGEE survey I. Uncovering [Fe/H] < -2.5 stars from the inner Galaxy to the Magellanic Clouds
• An ancient system hidden in the Galactic plane?